The Norwegian-Icelandic Vikings who settled in Vinland or today known as Newfoundland, scared the Indians, when they attacked, by using a cow. Funny story. But the Vikings left since when the Indians stopped trading with them, it was often cold and they were forced to eat their own dogs. So they left.

I read a similar article. Indians when the Vikings arrived to North America had a population i want to say almost double of what it was during the time the settlers arrived. The Vikings called the Indians ferocious warriors. The only reason white settlers didn't suffer the same fate is because a plague wiped out much of the Indian population before they arrived.